Ok, good luck and that's the best approach, but I hope you have access to some machining equipment and a very large and very specialized press. If not I'd love to come help and see how your going about the tube removal and repressing it back in. I'm not trying to be smart but what I've rersearched that alone requires some beefy equipment. I do believe some folks like Dyna track will do this as a service but I have no idea at what cost. Post up some pics if you get it figured out, I'd love to learn a feasible way to perform this method of swap.
Edit: Knuckles don't seem to be that hard, I've contemplated that but the tubes in the housing is where the work get tricky.